code: def main():
      train()
  
file_path: moolib/py/moolib/examples/a2c.py
imports: import csv
  import os
  import time
  import gym
  import torch
  from torch import nn
  from torch.nn import functional
  import moolib
label_desc: Use image node_id 5 for calling a global function with example usage: main() without return types